{"id":1577,"date":"2013-12-19T08:54:14","date_gmt":"2013-12-19T12:54:14","guid":{"rendered":"http:\/\/www.ttgnet.com\/journal\/?p=1577"},"modified":"2013-12-19T12:48:03","modified_gmt":"2013-12-19T16:48:03","slug":"thursday-19-december-2013","status":"publish","type":"post","link":"https:\/\/www.ttgnet.com\/journal\/2013\/12\/19\/thursday-19-december-2013\/","title":{"rendered":"Thursday, 19 December 2013"},"content":{"rendered":"

07:54 –<\/span> We’re in good shape again on biology and chemistry kits, so today I’ll focus on forensic kits. We have everything we need to put together another 30 forensic kits, except half a dozen or so chemicals that we need to make up and bottle before we can assemble the chemical bags.
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11:48 –<\/span> I just finished making up the last two solutions I need to make up more forensic science kits: one liter each of phosphate extraction reagent and molybdate reagent. The first is ammonium sulfate in a solution that’s about 33% sulfuric acid, about the same concentration as battery acid. The second is ammonium molybdate, also in 33% sulfuric acid.
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The phosphate extraction reagent made up with no problems, yielding a nice clear pinkish-tan solution. The molybdate reagent was obnoxious, as always. Even with reagent grade chemicals, a scum forms on the top of the solution. Oh, well. At least it’s reagent-grade scum.
\n<\/span><\/p>\n

I was about to filter the solution when I came to my senses. Pouring 6 molar sulfuric acid into a filter paper cone would char the paper very quickly, so filter paper is a no-go. The first time I made this stuff up, several years ago, I ended up building a sand filter. That worked, at the expense of considerable time and effort, not to mention losing a fair amount of the solution to the filter itself. Subsequently, I’ve always done what I eventually did today; carefully decanted off the clear solution, trying to keep as much of the scum as possible in the beaker. Good enough.
\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

07:54 – We’re in good shape again on biology and chemistry kits, so today I’ll focus on forensic kits. We have everything we need to put together another 30 forensic kits, except half a dozen or so chemicals that we need to make up and bottle before we can assemble the chemical bags.\n<\/p>\n

11:48 – I just finished making up the last two solutions I need to make up more forensic science kits: one liter each of phosphate extraction reagent and molybdate reagent.<\/p>\n

 » Read more about: Thursday, 19 December 2013  »<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[37,11],"tags":[],"class_list":["post-1577","post","type-post","status-publish","format-standard","hentry","category-lab-day","category-science-kits"],"_links":{"self":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts\/1577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/comments?post=1577"}],"version-history":[{"count":0,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts\/1577\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/media?parent=1577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/categories?post=1577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/tags?post=1577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}